FieldIndexKey


1   /* Copyright (C) 2004 - 2006  db4objects Inc.  http://www.db4o.com
2   
3   This file is part of the db4o open source object database.
4   
5   db4o is free software; you can redistribute it and/or modify it under
6   the terms of version 2 of the GNU General Public License as published
7   by the Free Software Foundation and as clarified by db4objects' GPL 
8   interpretation policy, available at
9   http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10  Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11  Suite 350, San Mateo, CA 94403, USA.
12  
13  db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14  WARRANTY; without even the implied warranty of MERCHANTABILITY or
15  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16  for more details.
17  
18  You should have received a copy of the GNU General Public License along
19  with this program; if not, write to the Free Software Foundation, Inc.,
20  59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
21  package com.db4o.inside.btree;
22  
23  
24  /**
25   * Composite key for field indexes, first compares on the actual
26   * indexed field _value and then on the _parentID (which is a
27   * reference to the containing object). 
28   * 
29   * @exclude
30   */
31  public class FieldIndexKey {
32      
33      private final Object   _value;
34      
35      private final int _parentID;
36      
37      public FieldIndexKey(int parentID, Object   value){
38          _parentID = parentID;
39          _value = value;
40      }
41      
42      public int parentID(){
43          return _parentID;
44      }
45      
46      public Object   value(){
47          return _value;
48      }
49      
50      public String   toString() {
51          return "FieldIndexKey(" + _parentID + ", " + safeString(_value) + ")";
52      }
53  
54      private String   safeString(Object   value) {
55          if (null == value) {
56              return "null";
57          }
58          return value.toString();
59      }
60  }
61
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